Details
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Bug
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Resolution: Unresolved
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P3: Somewhat important
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None
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5.13.0
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None
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Dell XPS 15 9560, Windows 10
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Windows
Description
Motivation: It may be necessary to activate DragHandler under a certain condition, or create dragging item dynamically and continue the gesture without the need to click again on the item containing DragHandler (This is partly related with https://bugreports.qt.io/browse/QTBUG-68075)
With the example code:
import QtQuick 2.13 import QtQuick.Controls 2.13 ApplicationWindow { id: root visible: true width: 640 height: 480 Rectangle { x: 130 width: 200 height: 200 color: backgroundDragHandler.active ? "red" : "orange" opacity: 0.6 DragHandler { id: backgroundDragHandler } } Rectangle { y: 60 width: 200 height: 200 color: tapHandler.pressed ? "red" : "green" opacity: 0.8 TapHandler { id: tapHandler onLongPressed: { console.debug("onLongPressed!") if (dynamicallyCreation.checked) { dynamicallyDragItemComponent.createObject(root); } else { fordegroundDragHandler.enabled = true; } } } Label { x: 160 y: 95 text: "1" font.bold: true font.pixelSize: 20 color: "black" Rectangle { anchors { fill: parent; margins: -10 } color: "transparent" border.color: "black" } } Label { x: 90 y: 20 text: "2" font.bold: true font.pixelSize: 20 color: "black" Rectangle { anchors { fill: parent; margins: -10 } color: "transparent" border.color: "black" } } Label { x: 160 y: 20 text: "3" font.bold: true font.pixelSize: 20 color: "black" Rectangle { anchors { fill: parent; margins: -10 } color: "transparent" border.color: "black" } } Label { x: 90 y: 95 text: "4" font.bold: true font.pixelSize: 20 color: "black" Rectangle { anchors { fill: parent; margins: -10 } color: "transparent" border.color: "black" } } } Rectangle { x: 50 y: 130 width: 200 height: 200 color: fordegroundDragHandler.active ? "red" : "blue" opacity: 0.6 visible: !dynamicallyCreation.checked enabled: !dynamicallyCreation.checked DragHandler { id: fordegroundDragHandler enabled: false } Label { anchors.bottom: parent.bottom text: "Drag enabled: %1".arg(fordegroundDragHandler.enabled) } } Component { id: dynamicallyDragItemComponent Rectangle { x: 50 y: 130 width: 200 height: 200 color: fordegroundDragHandler.active ? "red" : "blue" opacity: 0.6 DragHandler { id: fordegroundDragHandler } } } Switch { id: dynamicallyCreation anchors.bottom: parent.bottom text: "Dynamically creation of fordeground DragItem" } }
You may notice several problems (you have to start the sample application again for each case).
1. Steps to reproduce:
- Press and hold on rectangle with number 1
- Wait for longPress and activation of DragHandler (Drag enabled: 1)
- Drag (without releasing the mouse button before that)
or
- Activate switch Dynamically creation of...
- Press and hold on rectangle with number 1
- Wait for creation of blue rectangle
- Drag (without releasing the mouse button before that)
Result: Orange and not blue rectangle will be dragged
2. Steps to reproduce:
- Press and hold on rectangle with number 2
- Drag in direction of rectangle with number 3
or
- Press and hold on rectangle with number 2
- Wait for longPress and activation of DragHandler (Drag enabled: 1)
- Drag in direction of rectangle with number 4
or
- Press and hold on rectangle with number 4
- Wait for longPress and activation of DragHandler (Drag enabled: 1)
- Drag blue reactangle (without releasing the mouse button before that)
or
- Activate switch Dynamically creation of...
- Press and hold on rectangle with number 4
- Wait for creation of blue rectangle
- Drag blue reactangle (without releasing the mouse button before that)
Result: Dragged rectangle (DragHandler target) skip with its top left corner to place where drag begins, instead of smoothly dragging.